. their colossal in the amount of electricity they use. some use as much electricity as a medium-sized town. it is a very secretive industry. they tend to be hiding in plain sight. littlees you'll see diesel generators on the side. those are backup power supplies. and it is a data center. >> were those located at the road they're all over the place. they're in high rises in cities, in greenfield sites out in suburban areas, there tucked away in the back of offices. they are the way that most commerce takes place now. everyone has to have one. there are concentrations of the in the country. northern virginia, silicon valley. they're everywhere at this point. >> who runs them? >> a variety of players. companies that need these for their regular business owns some of these data centers, everything from walmart to microsoft. there is also a culture or commerce of renting space in dissenters. those are lesser-known names. one of them will sell you time on servers or space on servers. >> mr. glanz, what is contained inside these warehouse buildings? >> they're fairly boring places to visit.
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